diff --git a/zipline/protocol.py b/zipline/protocol.py
index 35cc5b7c..8013251e 100644
--- a/zipline/protocol.py
+++ b/zipline/protocol.py
@@ -125,6 +125,11 @@ class Order(Event):
             'stop',
             'limit',
             'id',
+            'filled',
+            'commission',
+            'stop_reached',
+            'limit_reached',
+            'created',
         },
     )